# 0626. Exchange Seats

<https://leetcode.com/problems/exchange-seats>

## Description

Mary is a teacher in a middle school and she has a table `seat` storing students' names and their corresponding seat ids.

The column **id** is continuous increment.

Mary wants to change seats for the adjacent students.

Can you write a SQL query to output the result for Mary?

```
+---------+---------+
|    id   | student |
+---------+---------+
|    1    | Abbot   |
|    2    | Doris   |
|    3    | Emerson |
|    4    | Green   |
|    5    | Jeames  |
+---------+---------+
```

For the sample input, the output is:

```
+---------+---------+
|    id   | student |
+---------+---------+
|    1    | Doris   |
|    2    | Abbot   |
|    3    | Green   |
|    4    | Emerson |
|    5    | Jeames  |
+---------+---------+
```

**Note:**

If the number of students is odd, there is no need to change the last one's seat.

## ac

```java
```